In the given figure, show that angle a+angle b + angle c+angle d=360

In the image, point a marks the center of the circle. which two lengths must form a ratio of 1 : 2? (options are in the images since thought they were harmful phrases)

Evaluate each expression. determine if the final simplified form of the expression is positive or negative -42 (-4)2 42

Asinusoidal function whose frequency is 1/6pi